In (X)HTML output, the BASE element can be generated with the html.base parameter. Unfortunally, this element is generated below the CSS elements. If CSS sheets have relative paths, their full path is not computed the same way as the rest of relative paths in the document.
Patch for HTML output
Path for XHTML output
Patch for XHTML-1_1 output
A fix for this issue has been added to the current codebase.
Please test the fix with the latest snapshot from:
http://docbook.sourceforge.net/snapshots/
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